100 lines
2.9 KiB
C#
100 lines
2.9 KiB
C#
using System;
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using System.Text;
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namespace GodotTools.IdeMessaging
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{
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public class MessageDecoder
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{
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private class DecodedMessage
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{
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public MessageKind? Kind;
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public string Id;
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public MessageStatus? Status;
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public readonly StringBuilder Body = new StringBuilder();
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public uint? PendingBodyLines;
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public void Clear()
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{
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Kind = null;
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Id = null;
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Status = null;
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Body.Clear();
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PendingBodyLines = null;
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}
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public Message ToMessage()
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{
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if (!Kind.HasValue || Id == null || !Status.HasValue ||
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!PendingBodyLines.HasValue || PendingBodyLines.Value > 0)
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throw new InvalidOperationException();
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return new Message(Kind.Value, Id, new MessageContent(Status.Value, Body.ToString()));
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}
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}
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public enum State
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{
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Decoding,
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Decoded,
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Errored
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}
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private readonly DecodedMessage decodingMessage = new DecodedMessage();
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public State Decode(string messageLine, out Message decodedMessage)
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{
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decodedMessage = null;
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if (!decodingMessage.Kind.HasValue)
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{
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if (!Enum.TryParse(messageLine, ignoreCase: true, out MessageKind kind))
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{
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decodingMessage.Clear();
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return State.Errored;
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}
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decodingMessage.Kind = kind;
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}
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else if (decodingMessage.Id == null)
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{
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decodingMessage.Id = messageLine;
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}
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else if (decodingMessage.Status == null)
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{
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if (!Enum.TryParse(messageLine, ignoreCase: true, out MessageStatus status))
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{
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decodingMessage.Clear();
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return State.Errored;
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}
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decodingMessage.Status = status;
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}
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else if (decodingMessage.PendingBodyLines == null)
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{
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if (!uint.TryParse(messageLine, out uint pendingBodyLines))
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{
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decodingMessage.Clear();
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return State.Errored;
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}
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decodingMessage.PendingBodyLines = pendingBodyLines;
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}
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else
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{
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if (decodingMessage.PendingBodyLines > 0)
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{
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decodingMessage.Body.AppendLine(messageLine);
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decodingMessage.PendingBodyLines -= 1;
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}
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else
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{
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decodedMessage = decodingMessage.ToMessage();
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decodingMessage.Clear();
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return State.Decoded;
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}
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}
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return State.Decoding;
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}
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}
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}
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